This is the part I have a big problem with and 100% disagree with. Following the advice of your priest/rabbi when you believe in your heart it is the wrong advice is not an excuse that is going to cut it when that time comes (IMHO).
That's not what I said. You're adding the part about advice that you feel is wrong.
I was talking about asking what religious obligatation you have, not advice. Also if you sense something is amiss it is important to question it.
In any case, I'll turn your question around and ask you, what would you do if you followed your religious creed and found out after 20 years that it was the wrong one?